It's not practical. Why are there buttons for toys and games? This is not a console for games. It's a car for driving. I shouldn't be able to access useless functions such as phone, calendar, text, games, browser WITH ONE CLICK (and not clickable while driving) when usable functions are 2-3 clicks away. Do we really need eyes away from the road? People are bad drivers to begin with.
Simply put, it's not practical. The UI is horrible and I designed/developed user interfaces for a top three insurance/financial firm in the country. I'm sure my background my leading design teams makes me irk at this UI even more so. But, you are correct. People will get used to it. Fact remains it's horribly designed.